PACKAGING MACHINE

摘要

PACKAGING MACHINE A packaging machine which has a station in which a thermoplastic packaging foil is heated to its thermoplastic state` by contacting with the surface of a heating plate. The contacting surface of the heating plate has a plurality of raised zones adjacent to and surrounded by interconnected retracted zones which together form a venting channel for preventing the inclusion of any residual air between the foil and the contacting surface of the heating plate. The raised zones are generally convex in shape, with continuous curvature towards the retracted interconnected and surrounding zones so that, in use, the foil may be applied across its total surface on the contacting surface of the heating plate without inclusion of residual air therebetween, thus achieving uniform heating of the packaging foil and avoiding any deformation or warping thereof.